They also took over 300 DNA samples from Legends Hotel staff members, which were sent to forensic experts in Bordeaux, France, to be tested against swabs already collected by the original police team.

A report on the samples was submitted last year to the DPP, however police only gained access to the file in recent weeks.

According to local sources, Prof Christian Doutremepuch from Bordeaux travelled to the Indian Ocean island last month to complete further tests.

It is understood that the CCID is waiting for the tests results before handing in their file to the DPP next week.

Inspector Roland Dabeesing previously admitted to the Irish Daily Mirror that he had been trying to secure John’s return to Mauritius.

Mr Dabeesing said: “I don’t know if Mr McAreavey will be able to come to Mauritius but I would really like for him to come over and to see him.”

He did not rule out Mauritian cops travelling to Ireland to meet John but said he would prefer for John to make the trip there.

“Coming to Ireland does not depend on me but I would like instead for Mr McAreavey to come to Mauritius because there are certain matters that need to be clarified and he might have to take us to the hotel so he can show us a few things.

“If I travel to Ireland he won’t be able to show me anything.”

John McAreavey and wife Michaela McAreavey on their wedding day

Mr Dabeesing was charge of the new enquiry into Michaela’s death until January 2014, when he was sanctionned for talking about the investigation.

Meanwhile, a spokesperson for the Legends Hotel, now known as Lux* Grand Gaube, issued a statement yesterday to a local media group claiming that Mauritian authorities had not informed them of any new development.

However, the hotel insisted that it had always cooperated with police, and will continue to do so.